diff --git a/yatex.el b/yatex.el
index 0e26706..c5f3c7d 100644
--- a/yatex.el
+++ b/yatex.el
@@ -1,6 +1,6 @@
 ;;; yatex.el --- Yet Another tex-mode for emacs //�쒹// -*- coding: sjis -*-
 ;;; (c)1991-2018 by HIROSE Yuuji.[yuuji@yatex.org]
-;;; Last modified Wed Jan 16 08:00:17 2019 on firestorm
+;;; Last modified Thu Jan 24 08:00:29 2019 on firestorm
 ;;; $Id$
 ;;; The latest version of this software is always available at;
 ;;; https://www.yatex.org/
@@ -16,7 +16,7 @@
 
 ;;; Code:
 (require 'yatexlib)
-(defconst YaTeX-revision-number "1.81.2"
+(defconst YaTeX-revision-number "1.81.3"
   "Revision number of running yatex.el")
 
 ;---------- Local variables ----------
diff --git a/yatexpkg.el b/yatexpkg.el
index 0752fbc..f701124 100644
--- a/yatexpkg.el
+++ b/yatexpkg.el
@@ -1,7 +1,7 @@
 ;;; yatexpkg.el --- YaTeX package manager -*- coding: sjis -*-
 ;;; 
 ;;; (c)2003-2018 by HIROSE, Yuuji [yuuji@yatex.org]
-;;; Last modified Wed Nov  7 08:57:36 2018 on firestorm
+;;; Last modified Thu Jan 24 08:00:20 2019 on firestorm
 ;;; $Id$
 
 ;;; Code:
@@ -32,6 +32,9 @@
     ("supertabular" (env "supertabular"))
     ("amsmath"	(env . YaTeX-package-ams-envs)
      		(section "tag" "tag*"))
+    ("amsart"	(same-as . "amsmath"))
+    ("amsbook"	(same-as . "amsmath"))
+    ("amsproc"	(same-as . "amsmath"))
     ("amssymb"	(maketitle "leqq" "geqq" "mathbb" "mathfrak"
 			   "fallingdotseq" "therefore" "because"
 			   "varDelta" "varTheta" "varLambda" "varXi" "varPi"